Describe defense-in-depth

The objective of defense-in-depth is to protect information and prevent it from being stolen by those who aren’t authorized to access it.

A defense-in-depth strategy uses a series of mechanisms to slow the advance of an attack that aims at acquiring unauthorized access to data.

Layers of defense-in-depth

You can visualize defense-in-depth as a set of layers, with the data to be secured at the center and all the other layers functioning to protect that central data layer.

Each layer provides protection so that if one layer is breached, a subsequent layer is already in place to prevent further exposure. This approach removes reliance on any single layer of protection. It slows down an attack and provides alert information that security teams can act upon, either automatically or manually.

Here’s a brief overview of the role of each layer:

• The physical security layer is the first line of defense to protect computing hardware in the datacenter.
• The identity and access layer controls access to infrastructure and change control.
• The perimeter layer uses distributed denial of service (DDoS) protection to filter large-scale attacks before they can cause a denial of service for users.
• The network layer limits communication between resources through segmentation and access controls.
• The compute layer secures access to virtual machines.
• The application layer helps ensure that applications are secure and free of security vulnerabilities.
• The data layer controls access to business and customer data that you need to protect.

These layers provide a guideline for you to help make security configuration decisions in all of the layers of your applications.

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